A thinking on Quantum Physics and common sense

The author attempts to answer the questions there are in the title of this paper. These questions are questions that scientists and philosophers have been asking themselves for many decades since Quantum Mechanics was formulated to explain the phenomena of the atomic and subatomic world. First of all a short but complete historical review of the transition between Classical Mechanics and Quantum Mechanics there is. It is preceded by some of the methodological premises that fit a certain vision of science. Then the author examines the issues and debates that have occurred on aspects of quantum mechanics such as realism, non-locality and probabilism (in contrast to determinism of Classic Mechanics). In doing this author llustrates the foundations of the various interpretations of quantum mechanics which, in an attempt to resolve these problems, have been given. The absurdities, and conflicts with the common sense, of quantum mechanics are shown to be largely apparent. In doing this, we examine the analogies of classical physics, as well as those of everyday life. Recent experimental results are taken into consideration. It is concluded that Quantum Mechanics presents elements of rupture more with Classical Physics than with the everyday experience.